# Worksheet: Converting Concentrations to pH and pOH

Q1:

What is the pOH of a 0.0125 M solution of potassium hydroxide, ?

• A0.0125
• B12.1
• C9.99
• D1.90
• E4.01

Q2:

To 1 decimal place, what is the pH of at ? Assume that ionizes completely.

Q3:

To 1 decimal place, what is the pH of at ? Assume that ionizes completely.

Q4:

To 2 decimal places, what is the pH of at ? Assume that ionizes completely.

Q5:

Calculate to 3 significant figures the hydroxide concentration of a solution with a pH of 6.52 at . The self-ionization constant of water, , is at this temperature.

• A M
• B M
• C M
• D M
• E M

Q6:

To 2 decimal places, what is the pOH of at ? Assume that ionizes completely.

Q7:

To 2 decimal places, what is the pOH of at ? Assume that ionizes completely.

Q8:

To 1 decimal place, what is the pOH of a 0.000259 M aqueous solution at ? Assume that is completely ionized.

Q9:

To 2 decimal places, what is the pH of at ? Assume that ionizes completely.

Q10:

What is the pOH of at ? Assume that ionizes completely.

• A2.5
• B11.8
• C11.5
• D2.2
• E1.7

Q11:

What is the pH of a 0.0125 M solution of potassium hydroxide, ?

• A0.0125
• B1.90
• C9.99
• D12.1
• E4.01

Q12:

To 2 decimal places, what is the pOH of at ? Assume that ionizes completely.

Q13:

To 1 decimal place, what is the pOH of at ? Assume that ionizes completely.

Q14:

To 2 decimal places, what is the pOH of at ? Assume that ionizes completely.

Q15:

The of the conjugate base of an unknown aqueous acid is 4.17. What is the concentration of the unknown acid?

• A M
• B M
• C M
• D M

Q16:

Coffee has a pH of about 5.1. Calculate to 2 significant figures the hydroxide ion concentration of coffee at .

• A M
• B M
• C M
• D M
• E M

Q17:

The hydronium ion concentration of vinegar is approximately M. What is the corresponding value of the pOH?

• A
• B2.4
• C1.0
• D12
• E13

Q18:

To 1 decimal place, what is the pH of at ? Assume that ionizes completely.